\magnification = \magstep2


$$
t_{\rm cross} \quad \equiv \quad {{R}\over{v}}
$$

$$
t_{\rm relax} \quad = \quad t_{\rm cross} \ \left( { {N}\over{8 \ln{N}} } \right) 
$$

$$
{{d V}\over{d t}} \quad = \quad - \ 
     {{ 4 \pi G^2 \thinspace (M \thinspace + \thinspace m)} \over{V^2}} \thinspace
            n m \thinspace \ln{\Lambda}
$$

\bye
